Baby Chicken Massacre, One Chick Left. Help!

[ChickensNCats]

I'm new to the forums, and hoped to get some advice.
I recently recieved six chicks from a friend, and introduced them to my older flock of four a few weeks ago. Everything was going smoothly up until Friday morning- when I awoke to five chicks vanishing without a trace. Using security footage I found and killed the culprit (a huge coon), but don't know what to do with my one surviving chick. I have no idea what gender it is. Whenever I go to the coop it is panicked, flying around and running from my older hens (who like to peck and chase it). I'm not sure what to do. Should I get more chicks? Leave it be? Let it go (I don't think I have the heart to though..)? Please help!

 

[Eggcessive]

Place it in a cage within your coop, and keep it with the other chickens outside in the cage during the day. When he/she is closer to their size, then let it out with the others. If you can locally find healthy chicks the same age, you could get a couple for company. Most chicks hang with similar aged chicks. Please make sure that your coop is locked at night and no predators can get inside. Sorry for your loss.